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It depends on how Apple implemented the backlight control. If they used the controller on the GPU, it may work with the new code. If they implemented it via some custom controller (often the case with Apple products) it won't help.

It depends on how Apple implemented the backlight control. If they used the controller on the GPU, it may work with the new code. If they implemented it via some custom controller (often the case with Apple products) it won't help.

So what generation chipsets does the Radeon ACPI improvements support. Will there ever be improvements for older generation chipsets?

The atom backlight control should work on all atom capable systems that utilize the on-chip backlight controller (r4xx-SI). The AMD specific ACPI methods work on any systems that implement them which I think started in the r6xx timeframe.